嫦娥六号采回的月球背面岩石，揭示月球内部“异常贫瘠”之谜

Core Insights - The Chang'e 6 mission has successfully returned samples from the Moon's far side, specifically from the South Pole-Aitken Basin, revealing significant geological characteristics of the lunar mantle [1][2][3] Group 1: Scientific Findings - The analysis of the basalt samples indicates a "super-depleted" state of the lunar mantle, characterized by a significant lack of incompatible elements [3][4] - The South Pole-Aitken Basin is the largest and oldest impact crater on the Moon, providing a unique opportunity to study the deep lunar crust and mantle [3][4] Group 2: Theoretical Models - Two models have been proposed to explain the "super-depleted" characteristics: 1. The "primordial depletion" model suggests that the Moon's early magma ocean underwent crystallization, leading to a natural depletion of incompatible elements [4][5] 2. The "post-impact modification" model posits that the massive impact that created the South Pole-Aitken Basin significantly altered the composition of the lunar mantle, resulting in the depletion of volatile elements [5][6] Group 3: Implications for Lunar Research - The findings from the Chang'e 6 mission provide critical evidence for understanding the early layering, cooling, and evolution of the Moon's interior, which is essential for addressing the differences between the Moon's near and far sides [6]